Ash pit door carried draft regula



Feb. 6., 1951 A T CRUMBIAKER 2,540,657

ASHPIT noo'R CARRIED DRAFT REGULATOR FOR GRANULAR FUEL BURNING STOVES Filed March 24, 1947 H /[011T Grumbalier 24 fifi'orneg Patented Feb. 6, 1951 UNITED STATES PATENT OFF-ICE ASH- PIT DOOR: CARRIED DRAFT REGULA- TOR FOR GRANULAR FUEL BURNING STOVES Allen Tracy Crumbaker, Olarkeston, Wash.

Application March 24, 1947, Serial No. 736,737

1 Claim. 1

My invention relates to a hopper for continuously feeding fuel in dust forms to a stove or furnace, and regulating the draft to obtain complete combustion therein. This hopper and regulating system is constructed in the shape of an adapter for attachment to the furnace and is of such form that it can feed any kind of cheap fuel, such as sawdust or coal dust, without aid of special grates and requiring no changes in the furnaces.

It allows of easy access for cleaning out ashes.

By this means any type of stove or furnace can be converted to burn cheap fuel without danger of explosion, particularly as all grates are eliminated.

These and other objects and advantages will be understood from the subjoined description with the aid of the attached drawing.

Like numerals denote the same details in the diiferent views of the drawing, wherein:

Figure 1 is a front elevation of a conventional stove with myhopper and draft regulator in position;

Figure 2 is a perspective view of Figure 1;

Figure 3 is a perspective view of one form of the hopper;

Figure 4 is an exploded perspective view of the cylindrical draft regulator;

Figure 5 is an elevational view of the draft regulator assembled on the ash pit door.

Figure 6 is a sectional view taken substantially on the line 66 of Figure 5.

In the drawing, numeral I0 denotes a cylindrical fire box or drum stove below and an air heater II thereabove of a conventional stove or furnace with suitable conduits.

On one side of the fire box H) is erected a metal hopper or funnel l2 for fuel in dust form, which opens through the sheet metal wall of, and into, the drum. This funnel is set at a slight inclination, so as to deposit fuel in a pile I3 on the bottom of the fire box In which is without grates of any kind.

The hopper l2, made of metal, may be of any suitable size and shape, such as an inverted cone or a pyramid, shown in Figure 3, as best suited to the particular type of stove or furnace, on which it is applied to form a unit with the latter and secured by welding or any other suitable means, as, for example, the metal strap 14, Figures 1 and 2.

As sawdust or other cheap fuel is supplied from the hopper, air is admitted to the stove body at its front end through a cylindrical draft regulator l 5, mounted on the outer sideof a lower hinged ash pit door 2|, and the sawdust will be distributed as seen in Figures 2 and 5 so that the infiowing air will pass over the surface of the sawdust to maintain the desired combustion.

This regulator consists of a hollow metal cylinder l5 with its side wall perforated by slots or drilled holes as at It. This cylinder is open ended, but provided with a cover plate I! at its outer end, which has a semi-circular cut [8 in its lower half for removal of ashes and a central hole IQ for receiving the outer end of a securing bolt 20 and nut. The head of the bolt 20 engages behind a bar 20' which extends diametrically across a circular opening 2| formed in the door, the bolt passing through the center of the bar as shown in Figure 5.

The third member of this regulator unit consists of an outer hollow cylindrical sleeve of the same length as the perforated cylinder l5 and adapted to slide over the outer surface of the latter, the outer end of the sleeve or can 22 being closed as at 24. By means of this regulator it is now possible to control, to a nicety, the amount of draft or supply of combustion air for the fuel, which air enters into the combustion chamber by way of the apertures l6 which are left open by the sleeve 22.

The half-moon opening on the lower side of the cover plate !8 is intended for removal of ashes as they collect in the regulator cylinder l5; the sleeve or can 22 having been first removed.

When in the claims the term furnace is used, the same is intended to cover any other heating plant such as stoves and the like for heating a fuel medium.

It is to be understood that the invention as herein disclosed may be varied from the details described and shown without departure from the spirit of the subjoined claim.

I claim:

7 In combination, a stove ash door, the door having a circular opening centered therein and a draft regulator, said regulator comprising an open ended cylindrical member having one end secured to the door about said opening, said member being longitudinally and circumferentially perforated, a circular plate having a cutout of segmental form formed therein below an aperture formed in its center, a centrally apertured bar fixed to the door and extending dia metrically across said circular opening, a bolt engaged in the said plate and the bar apertures to retain said plate within the outer end of said member, and a cap closure slidably engaged on 3 said member to regulate the admission of air through the perforations of said member to the interior of the stove, said cutout allowing for the removal of ash accumulations within said member upon the removal of the cap closure from 5 the latter.

ALLEN TRACY CRUMBAKER.

- REFERENCES CITED The following references are of record in the 10 file of this patent:

UNITED STATES PATENTS Number Name Date 308,911 Lowrey Dec. 9, 1884 5 Number Number Name Date Cole July 17, 1894 Munson Sept. 8, 1896 Stehle May 18, 1897 Palmer Apr. 26, 1898 Reed Jan. 10, 1899 Cadman July 25, 1899 McCoy Sept. 6, 1927 Snyder May 5, 1931 FOREIGN PATENTS Country Date Germany June 8, 1936 France Apr. 9, 1934 

